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Para-virtualization systems such as Xen inhabit a popular corner of the virtualization landscape, but other technologies are also emerging. The Linux-VServer project represents a different approach to virtualization. VServer [1] and similar projects use a technique known as kernel-level isolation. Kernel-level isolation provides the virtual system with an isolated share of resources on the physical system. Other virtualization schemes typically require a separate kernel and separate memory and disk space for each virutal system. With VServer, on the other hand, the virtualization occurs at the interface of the virtual process with the host kernel. All virtual systems share the same kernel, and virtual processes actually run as regular processes on the host.

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